Slug Wrenches Striking Wrenches wall and thickness optimized for heavy impact, Powermaster also manufactures castellated wrenches for use on GE turbines. Along with castellated wrench, GE turbine tools like castellated sockets, stack sockets, Striking Wrenches, slug wrenches, podger spanners, slug spanners are also manufactured.Large percentage of our revenues are spent in improving designs and life of our products. New innovations on products in this catalogue are world’s firsts - ONLY WITH POWERMASTER.